Screw-making machine



(No Model.) 5 Sheets Sheet 1.

, R. HAKEWESSELL.

SCREW MAKING MACHINE.

No. 530,179. PatentedDeo. 4, 1894.

By 515 f3 fol-n y,

(No Model.)

V 5 Sheets- -Sheet 2. R. HAKEWESSELL. SURE-W MAKING. MACHINE.

No. 530,179. Patented Dec. 4, 1894;

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R. HAKEWBSSELL. SCREW MAKING MACHINE Patented Dec. 4, 1894,

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ls PETERS 0a,. Pn'am-uma. wnsnms (No Model.) 5 SheetsSheet 4.

R. HAKEWBSSELL. SCREW MAKING MACHINE No. 530,179. Patented Dec. 4, 1894.

By 171's Alia-nay,

m5 nomus wErERs 00., PHOTO-H1110 wAsulnmoM u c (No Model.) 5 SheetsSheet5.

R. HAKEWESSELL.

SCREW MAKING MACHINE.

No. 530,179. Patented Dec. 4,1894.

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EJ ITED STATES PATENT OFFICE.

REINHOLD HAKEWESSELL, OF HARTFORD, CONNECTICUT, ASSIGNOR, BY MESNEASSIGNMENTS, TO HIMSELF AND HORACE S. FULLER, NATHAN F. MILLER, ANDWILLIAM J. GABB, OF SAME PLACE, AND EDWIN C. HENN, OF BLOOMFIELD,CONNECTICUT.

SCREW-MAKING MACHINE.

sIE-CIFICATION forming part of Letters Patent No. 530,17 9, datedDecember 4, 1894. Application filed November 18, 1893. Serial No.491,317. (No model.)

To whom it may concern:

Be it known that I, REINHbLD HAKEWES- SELL, a citizen of the UnitedStates, residing at Hartford, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements inScrew-Making Machines, of which the following is a specification.

This invention relates to improvements in screw-making machines, theobject of the invention being to produce a screw-making machine whichwill be automatic in its operation and of such construction andorganization that a series of screw-rods may be operated uponsimultaneously, but independently, by tools performing separate anddistinct functions; also to provide means for automati-;

cally feeding or presenting each screw-rod of the series (afterit hasbeen operated upon by one tool) to the next adjacent tool and,successively, to the remaining tools of the series, whereby a pluralityof screw-rods may be under-going separate and distinct operationssimultaueously, and by such successive operations one screw be completedby each operation or complete movement of the machine.

Another important object of my present invention is to so construct thescrew-threading die-mechanism that the screw-threading die may bescrewed upon, and withdrawn from, the screw-rod, in the operation ofcutting the thread without reversing or interrupting the movements ofthe drivingmechanism, or of the rod-carrying spindles, and thereby avoidthe loss of time common to machines of ordinary construction wherein itis customary to cut the thread upon the screw-rod by a movement in onedirection, and withdraw the screw-rod by unscrewing the same in theopposite direction, necessitating a reversal of the driving mechanismand requiring the same length of time to withdraw the cutting-die as tocut the thread.

With these objects in view, the invention consists in the organizationof mechanism, and in the special construction of the several parts ofthe screw-making, machine, as here- I inafter more fully described andset forth in the claims.

In the drawings accompanying and forming a part of this specification,Figure 1 shows in side elevation, a screw-making machine embodying mypresent invention, said figure showing the parts in their normal orinactive position. Fig. 2 is a view similar to Fig. 1, showing the partsin the position they occupy when the screw-rods are being acted upon.Fig. 3 is a plan view of the machine, the several parts thereof being inthe relative positions shown in Fig. 1. Figs. 4, 5 and 6 are verticalcross-sectional views of the machine taken in dotted lines a-a, bb andc/:, re-

spectively, Fig. 1, as seen from the left-hand in said figure, the legsof the machine being omitted. Fig. 7 is an end elevation of the machineas seen from the left-hand in Fig. 1. Fig. 8 is an end elevation of themachine, as seen from the right-hand in Fig. 1. Figs. 9 and 10 arevertical longitudinal sections of a portion of the machine taken indotted lines d-d and 6-6, respectively, Fig. 3.

Similar characters designate like parts in all the figures.

In the organization of thisimproved screwmaking machine there are sevenprincipal elements, namelyfirst, a sliding tool-carrier adapted forcarrying a plurality of tools, one or more of which are revolubletherein; second, means for automatically feeding said tool carriage andlimiting the movement thereof with relation to the work, and forindependently rotating one or more of said tools; third, anintermittently revoluble work-spindle-carrying head or turret having aseries of longitudinally disposed spindle-holding sockets formedtherein; fourth, a series of workholding spindles or chucks revolublysupported in said turret; fifth, mechanism for imparting an intermittentrotary movementto said turret; sixth, means for independently rotatingthe work-holding spindles and the screw-rods held therein, and, seventh,for feeding mechanism for automatically feeding forward. the screw-rodswhich are to be operated upon successively by the various tools of themachine.

The framework of the machine, which is designated in a general way by A,may be of any form and construction suitable for carrying the severaldetails of the mechanism. In the form thereof herein shown, it consists,essentially, of a bed comprising two side rails, 2 and 4, and end rails,3 and 5, supported upon suitable legs; and the usual oil-pan, 7, locatedunderneath the working parts of the machine, it being shown in thedrawings as forming the base portion of the machine.

Formed in the side rails 2 and 4: of the machine, are longitudinalslide-ways, 8 and 9, fitted to which, and held in place by the usualstraps, 10 and 11,is the longitudinally sliding tool-carriage B, havinga tool-carrying head, 0, at or near its forward end, as shown in Fig. 1.This head has formed therein a series of tool-carrying sockets, 12,arranged eqni-distantly about a common center, and in which aresupported (either fixedly or revolubly as will be hereinafter described)a series of screw forming tools herein shown as four in number, anddesignated by 13, 14, 15, and 16, respectively.

The work-spindle-carrying head or turret D is revolubly supported in anupright bearing, 17, formed preferably integral with the bed of themachine near its forward end. This chuck-carrying head is flanged at itsrear end as shown at 18 to fit an annular groove at the rear end of thebearing and prevent longitudinal displacement, and has secured to orformed upon its forward end concentric to the axis thereof, a spur, ordrivingwheel, 19. Formed longitudinally through said turret D, are aseries of sockets or bearings, in each of which sockets is journaled atubular shaft, 20, which proj ects somewhat beyond the forward endthereof. This shaft is conically bored at its rear end, as shown at 21,and has loosely journaled therein a split chuck-sleeve or work-carryingspindle, 22, having its rearward end flared or conically flanged asshown at 2i, to coincide with the conical bore 21 of the said tubularshaft 20. Through these spindles 22, are extended the serew-rods, 25, tobe operated upon.

Keyed to each of the tubular shafts 20, as most clearly shown in Figs.1, 2, and S, is a pinion, 26, the axes of which pinions areequidistantly disposed with relation to a common center and are drivensimultaneously by means of a gear-wheel, 27, secured to the forward endof the main driving shaft, E, of the machine; which shaft is journaledat its forward end in the work-carrying head or turret D, and at itsrear end in a bearing, 28, secured to, or forming a part of the frame ofthe machine. Said shaft extends through the toolcarrying head as shownin the drawings, and is provided at its rear end with the usual drivingpulley, 29.

In the construction of the spindle-carrying head D, the same may beadapted for carrying an indefinite number of work-spindles,

- and the tool'carrying head may be likewise constructed to carry anequal number of tools to operate upon the screw-rods carried by the saidspindles. The number of work-carrying spindles and tools provided, will,of course, depend upon the form of screw it is desired to make. In thepresent instance, as shown in the drawings, the Work-carrying head isprovided with four screw-rod-holding spindles, which are adapted forindependent rotation through the medium of the usual gearing shown,consisting of wheels 26, one for each spindlechuck and a central wheel27 upon the main shaft of the machine.

Through mechanism as hereinafter described, the work-carrying spindleshave not only a rotary movement about their individual axes, but alsohave an intermittent rotary movement about a common axis. Thisintermittent orbital motion is imparted to the series of Work-carryingspindles for the purpose of bringing the screw-rods carried by saidspindles successively into axial alignment with,and in position forbeing operated upon by, the tools upon the tool-carrying head 0. As ameans for securing this intermittent orbital rotary motion to thework-carrying spindles about a common axis, a segmental gear-Wheel, 30,is provided,which, as shown in the drawings, is carried upon the centershaft, 31, journaled in a bracketed bearing, 32, formed upon or securedto the lower portion of the frame of the machine. This segmentalgear-Wheel meshes with a spur-wheel 19 upon and intermittently rotatesthe Workcarrying head D. The toothed segment or portion of saidsegmental wheel is of suiticient length to rotate the spur-wheel 19 andthe connected head D approximately onefourth of one revolution, and toallow said head to remain stationary the properlength of time for thetools to complete their operation upon the ends of the screw-rods. Anordinary locking-device will be provided, as hereinafter described, forengaging and locking the turret or work-carrying head in its successiveoperative positions. The extent of rotation of the turret head D and thelength of time intervening between movements thereof will depend, ashereinbefore stated, upon the nu mber of work-carrying spindles andtools employed.

Secured to the shaft 31, upon which the segmental gear-wheel is mounted,isapinion, 33, which meshes with a gear-wheel, 34, upon the forward endof a cam-shaft, F. This camshaft is journaled in bearings at its eitherend in the framework, as shown in the drawings, and has at its rear enda worm-wheel, 35, which meshes with, and is driven by, a worm 36, upon atransverse worm-shaft, 37, journaled in bearings, 38, upon the rear endof the frame of the machine; said shaft 37 being provided with asuitable driving-pulley, 39, at one end thereof, whereby the camshaftmay be actuated.

As a means for actuating and governing the movement of the slidingtool-carriage, a cam-wheel, 40, is provided which is secured to thecam-shaft F and has a cam-groove, 41,

'formed in its periphery as-shown. A stud,

42,secured at its upper end in the tool-carriage B, isprovided to securean operative connection between said cam and tool-carriage, which studwill preferably be provided with a friction roller at its lower end toenter the cam-groove 41 of the cam-wheel 4Q.

. This cam-wheel may be of any desired construction to give the requiredforward and return movements to the tool-carriage.

As shown in the drawings, the tool-head, in my present machine, willpreferably be constructed in two pieces, 11. e.-the forward or mainportion, 43, secured to or formed apart integral with the tool-carriage,and the backplate, 44, secured to the tool-head by means of suitablescrews, a series of blocks, 45, being interposed between said plate andtool-head to leave sufficient space between said head and back plate forthe interposition of tooldriving mechanism. These spacing-blocks 45 areherein'eshown as three in number, they being held in place by means ofthe screws 44 as shown.

To accomplish one of the chief objects of my present invention, which isto provide for the release of the screw-cutting die from the end of thescrew-rod after the thread has screw-rod being operated upon by saiddie.

For this purpose I have provided a sleeve or tubular shaft, 46, which issupported in the socket in the tool-carrying head and extends throughboth parts 43 and 44, respectively.

This shaft is provided at its forward end with one member of a pull-offor pin clutch-do vice to engage the other member of a like clutch-deviceupon the die-carrying head, 48; which die-carrying head is secured to adiespindle, 49, revolubly supported in the said sleeve or shaft 46.Secured to the spindledriving shaft 46, between the front and backplates 43 and 44 of the tool-carrying head, is a pinion, 50, whichmeshes with and is driven from the gear wheel 51, splined to the mainshaft E of the machine, as most clearly shown in Figs. 2 and 9. Saidsplined connection between the gear-wheel 51 and shaft E permits saidgear-wheel to be revolved with the shaft and also permits amovementlongitudinally of said shaft during the reciprocation of thetool-carriage B. Secured to, or formed upon, the rear face of theback-plate 44, of the toolhead, concentric to the tool-carrying spindle,is a bevel-face annular projection, 52, which constitutes one member ofa friction-clutch,

. or brake, the other member of which consists of a collar, 53,conically'bored at its forward dle nearits rear end, and is adapted forlongitudinal movement upon said spindle, the pin 54 and slotlimiting themovement thereof. Screwed upon the rear end of the spindle is a nut, 56,and interposed between said nut-and brake-member 53 is a spiral spring,57, the function of which spring is to throw the brake-member 53 forwardupon the spindle in position to engage the brake-member 52 during thebackward movement of the tool-carriage, thu's. breaking the die-spindleagainst rotation, which, in consequence of the continued rotation of thescrew-rod itis acting upon, will cause said die to be unscrewedtherefrom, as will be hereinafter more clearly described. Instead ofthis friction-brake or -clutch, a toothed clutch may if preferred beemployed. This organization and construction of the die-actuatingmechanism accomplishes a result of material importance in machines ofthis class, in that it permits the unscrewing of the screw-cutting diefrom the shank of the screw without reversing the driving mechanism, itsimply being necessary to rotate the screw-rods at one speed and the dieat a greater speed in the same direction.

With my machine, in practice, the screwrod to be operated upon by thescrew-cutting die will berotated by means of the gearing beforedescribed in the direction of the arrow shown in Fig. 5, and thedie-carrying spindle 49 which is to operate upon the end of said rod, isrotated by means of its gearing in the same direction as shown by thearrow in Fig. 5, but at considerably greater speed than the screw-rod.The difierence between these two speeds constitutes the effectivecutting; speed of the die, which may by this means be made very slow, asrequired for making steel screws. I

In the operation of the machine, the screwcutting die will be so setwith relation to the work and with relation of the movement of thetool-carriage, that in cutting the thread the die-carrying head 48 willbe released or .drawn off from the tubular shaft by the retractivemovement of the carriage B at the completion of the cutting of thescrew, which will bring the two clutch-members 52 and 53 at the rear endof the spindle into frictional engagement, (or locking engagement, asthe case maybe) thus stopping the rotation of the die, which, inconsequence of the rectracting stress of the spring 57, will beunscrewed from the rod and will resume its operative engagement with theshaft 46, whereby it is rotated, the parts at this time assuming theposition shown in Fig. 9.

It is not desired to limit this invention to the exact construction andorganization of tool-mechanism or rod-carrying mechanism shown in thedrawings, as for instance, it might sometimes be desirable to hold therods fixedly with relation to the tools operating thereon, as whenmaking rivets and similar .articles, in'which case it might be desirableto rotate allof the series of tools instead of one as hereinbeforedescribed.

In the drawings I have illustrated one form of clutch-mechanism foroperating the workholding chucking-spindles to grasp the rods, and meansfor automatically feeding the wires into position to be operated upon bythe several tools. Briefly stated, this mechanism consists of a set ofelbow-levers, 60, G0, pivoted upon a collar, 61, secured to the forwardend of the tubular shaft 20 journaled in the turret head D. These levershave two inwardly extending arms, 62, 62, so disposed with relationtothe levers as to be thrown forward as said levers are pressed outward.These arms 62, 62, bear at their inner ends against the rear face of aflange upon the rear end of the chuck-sleeve or work-spindle 22 and areadapted, (as the levers 60 are thrown outward) to move the spindleforward, bringing its inclined or conical-faced rearward end against theconically bored rearward end of the tubular shaft which compresses thespindle and grasps the screw-rod therein, as will be clearly apparent byreference to Figs. 9 and 10 of the drawings. As a means for spreadingthe levers 60 of the clutch to actuate the spindle and grasp the rod, afrustro-conical hub, 63, is loosely journaled upon the forward end ofthe work-spindle 22 slightly in advance of said levers, which hub ismoved endwise upon said spindle at the proper time for releasing fromand engaging with the spindle and the screw-rod, by means of theshipper-lever, 64:, which is actuated by a cam, 65, secured to thecounter-shaft 31 as will be hereinafter more fully explained. The hub 63has an annular groove, 66, of sufficientlength to receive andpermit freelongitudinal movement of one arm of the bifurcated or forked end, 67, ofthe shipper-lever 64c, for the purpose hereinafter set forth. Secured tothe extreme rear end of the work-spindle 22 is a grooved collar, 68,having its end divided longitudinally as shown at 69, and adapted to becompressed to impinge the spindle 22, which being slit at this end, willin turn impinge the screw-rod. This collet has projections, 70, at oneside through which is extended a lag-screw or bolt, 71, by means ofwhich the impinging pressure of the spindle upon the screw-rod may beregulated. The forked shipper-lever has one of its arms extended intothe annular groove of the collar 68 and is adapted to move the samelongitudinally upon the spindle, as and for the purpose hereinafter setforth. The operation of this clutch-mechanism is as follows: After thefinished screw has been out off by means of the cutter hereinafterdescribed, and at the time the work-carrying head D has been revolved tothe position to bring the next adjacent rod to the action of the cutter,and while said cutter is acting upon the next adjacent rod, theshipper-rod is shifted to the right hand which first acts upon thecollar 68 to shift the collar longitudinally upon the rod a shortdistance without disturbing the position of the work spindle or rodimpinged thereby. After the shipper-rod has been moved to the right-handthe length of the annular groove in the hub 63, it then acts upon theforward flange of said hub,withdrawing the same from between the levers60 which releases the spindle from impingement with the rod at the rearend and permits the said rod upon the reverse motion of theshipper-lever to be fed rearward the requisite distance, and in positionto be operated upon by the successive tools, the retractive movement ofsaid shipper-lever first acting to feed the screw-rod as described, andafter the said rod has reached its proper position, to shift the hub 63to the position shown in Fig. 9, spreading the levers 60 of the clutchwhich throws the clutch-sleeve backward and again impinges the screw-rodat its rear end.

In the drawings, the cam for operating the shipper-lever, is shown ashaving the camgroove, 75, in which the lower end of the shipper-levertravels, said shipper-lever being preferably bifurcated at this end asshown in dotted lines in Fig. 8. It is obvious that any suitable devicemight be employed for operating this clutch-mechanism. just describedwithout departing from my invention.

In the drawingsI have shown one form of cut-off device designated in ageneral way by G, it consisting of a transversely sliding toolcarrier,77, supported on ways secured to or formed upon the bed of the machine,and a cutting-tool, 78, adj ustably secured in said tool-carrier, asmost clearly shown in Fig. 5. As a means for automatically feeding saidcutoff tool to the work, I have provided a lever, 79, fulcrumedintermediate to its ends to a stud, 80, secured to the side-rail of thebed of the machine. The upper end of this rod is longitudinally slottedand engages a projection or pin upon the inner end of the toolcarrier,the lower end of said lever 79 engaging the cam-face of a. cam, 81,secured to the camshaft F, which cam-shaft is of a construction to throwthe upper end of the lever 79 inward at the proper time to feed thecut-off tool to the work, a spiral spring, 83, being provided as clearlyshownin Fig. 5, to retain the lower end of the tool-slideactuating-lever in contact with said cam, the said spring beingconnected at one end to the lever below its fulcrum point, and at itsopposite end to a pin 84 or other suitable device secured to the0pposite side of the frame.

The turret or work-carrying head D has formed in its periphery a seriesof locknotches, 85, adapted to be engaged by a lockbolt, 86, to lock thesaid head in its successive positions and with its screw-rods inposition to be operated upon by the several tools. This lockingmechanism consists preferably of the bolt 86 carried in a sleeve orbarrel, 87, secured to the under side of the bearing 17 as shown mostclearly in Fig. 6.

.revolve at the proper relative speeds.

or shank, 88, which extends through the sleeve 87 and has a flange atits lower end to be engaged by the arm, 89, of a bell-cranked lever,pivoted to the framework of the machine. The opposite arm, 90, of saidlever will preferably be provided with a friction roller at its extremeend which engages the cam-face of a lock-bolt-actuating-cam, 91, securedto .the cam-shaft F. A spring, 92, is interposed between the lower faceof the lock-bolt and the bottom wall of the sleeve and acts to retainthe friction'roller of the bell-crank arm 90 in engagement with the cam91.

It will be understood that the lock-bolt actuating cam and cut-0E camwill be of such construction and so timed in their movements withrelation to the movements of the workcarrying head Das to lock the saidhead in its successive positions at the proper time and to throw thecut-0E tool into operation while said turret head is so locked, alsothat the cam which actuates the clutch-mechanism to cause the releasing,feeding and re-grasping of the screw-rod will also be timed in itsmovements with relation to the work-carrying head-actuating mechanism asto feed the rod into position to vbe acted upon by the different toolsimmediately after the said rod has been out offby the cutting-0E tool.

The general operation of my screw-making machine is as follows: The rods25 having been inserted into and through the work-carryingspindles 22,and said spindles having been firmlyclamped thereto at the rearendsthereof by means of the clutch-device as hereinbefore describe d,and the several parts of the machine being in the position shown in Fig.2 of the drawings, power is applied to pulleys 29 and 39 of the mainshaft E and camshaft F, respectively, to cause said shafts to The cam 91first acts to disengage the lock-bolt 86 from the lock-bolt-notch in thework-carryin g head D, after which the segmental gear-wheel 30 in meshwith the spur-Wheel 19 upon the said head D, acts to revolve said headin the direction indicated by arrow in Fig. 5, the main shaft E in themeantime rotating the work-carrying spindles and the screw-threading dieindependently about their individual axes at their proper relativespeeds in the same direction as indicated by the arrows in FigsA: and 5,the said head being in thisoperation rotated about its axis a distanceequal to the angulardistance between two of the rodcarrying spindles.When this motion is com pleted, the look-bolt is immediately thrownupward into the notch 85 through the medium of the lock-boltactuating-lever, its spring and cam, which looks the head D againstfurther movement about its axis until the shaft F has rotated thecam-wheel 91 sufficiently far to bring its eccentric portion intoengagement with said lock-actuatinglever. This rotation of thework-carrying head D brings one of the screw-rods in position to be fedforward by means of the clutch-mechanism a distance equal to the lengthofscrew it is desired to make, the cam acting at this time to shift theshipper-rod 64 which as before described, slides the hub 63 and sleeveof the clutchmechanism toward the right, and then toward the left torelease the rod, feed forward and re-grasp the same as hereinbefore setforth, leaving the rod projecting theproper distance beyond the rearface of the turretvhead to be acted upon by the successive tools of themachine during the successive movements of the said head. After the rodhas been positioned, the segmental gear-wheel again acts to rotate thework-carrying head to bring the rod so positioned into alignment withthe next adjacent tool, which in thisinstance will be the shaping-tool.After the rod has reached this position, the tool carriage is fedforward through the medium of its cam which brings the tools intoengagement with the several rods carried by the head D.

In practice, the majority of the tools will have a slight lead over, orextend slightly in advance, of the screw-threading die, which lead willpractically be the distance of movement of the die-head necessary fordisengaging or drawing-01f said head from its driving shaft which may bemore or less according to the clutch-devices employed therewith. Theobject of this is to permit the screwt-hreading die, which rotates inthe same direction as the screw-rod, but with an increased speed, tocontinue its cutting-movement a short period after the tool-carryinghead-actuating-cam has reversed the movement of the tool-carriage, thereverse or backward movement of said carriage carrying the dieshaft withit, releasing the diehead from operative engagement with said shaft, andat the same time bringing the brake-members upon the spindle intofrictional engagement and at once stopping the rotary movement of thedie-head, which will then be withdrawn or unscrewed from the screw-rodin consequence of the continued rotation of the screwrod, backwardmovement of thetool-slide, and inactivity of said die-head; this actiontaking place without reversing the driving-mechanism and during the timethe tool-carriageis assuming its former or normal position.

It will be seen that by the use of my improvement, material advantagesare attained, in that a series of screw-rods are successively operatedupon to complete the screw by a series of successive tools,simultaneously, obviating the necessity of several distinct andindependent operations upon a single screw as heretofore. common inscrew-making machines of ordinary construction.

Having thus described my invention, I claim a 1. In a screw-makingmachine, thecombina- IIO tion with the frame-work, of the revolublechuck-carrying head supported in a hearing at one end of the frame, themain shaft revolubly-supported at one end in said head and at itsopposite end in a bearing upon the frame, a series of work-carryingspindles revolubly'supported in tubular shafts in said head, means forintermittently rotating the head upon the shaft, means forsimultaneously rotating the spindles upon their own axes, a tool-carrierconstructed and adapted to be moved toward the work-carrying spindlesalternately with each intermittent movement of the revoluble head, adie-carrying spindle revolubly supported and adapted forlongitudinalmovement in a tubular shaft journaled in the tool-carrier, mechanism forcontinuously rotating the die carrier shaft, and two oppositely-operableclutch-devices located at opposite ends of the die-spindle and adaptedfor alternate operation whereby upon the advancing movement of thetoolcarrier the die-spindle is rotated with its shaft and upon theretractive movement of said tool-carrier the die-spindle is lockedagainst rotation, substantially as described and for the purpose setforth.

2. In ascrew-making machine, in combination, a revolublespindle-carrying head supported in a suitable bearing, a gear-wheelsecured to, or formed a part of said head, a series of work carryingspindles revolubly mounted in said head, mechanism for simultaneouslyrotating said spindles, a geansegment meshing with the gear-wheel ofsaid head and adapted for intermittently rotating the same to bring thespindles thereof successively into alignment with the screw-formingtools of the tool-carrier, mechanism for driving said gear-segment, alocking-device for intermittently locking and releasing said headbetween successive rotations, a sliding tool-carrier carrying a seriesof screw-forming tools in position for engagement with the work carriedby the spindles, means for moving said tool-carrier toward and from thespindle-carrying head, and means for rotating one of said tools in thetool-carrier, substantially as described and for the purpose set forth.

3. In a screw-making machine, the combination with framework, of therevoluble chuckcarrying head D supported in a bearing at one end of theframe, the main shaft E revolubly supported at one end in said head andat its opposite end in a bearing upon the frame, work-carrying spindlesrevolubly supported in tubular shafts journaled in the work-carryinghead; pinionssecured to said shafts which mesh with a gear-wheel securedto the main shaft, means for intermittently rotating the work-supportinghead about its axis, a locking-device therefor, a sliding toolcarryinghead intermediate to the two bearings of the main shaft, a die-carryingspindle revolubly supported in a tubular shaft journa'led in saidcarrier, a pinion secured to said spindle-carrying shaft, adriving-wheel therefor secured to and adapted for longitudinal movementupon the main shaft, means for moving the tool-carrier toward and fromthe head D and for locking the die-carryingspindle against rotationduring the backward movement of said carrier, substantially as and forthe purpose set forth.

4:. In a screw-making machine, the combination with the intermittentlyrevoluble workspindle head D having a series of work-carrying spindlesrevolubly supported therein and having a peripherally disposedgear-wheel and peripheral lock-notches, of the gear-segment 3O meshingwith the gear-wheel of the said head and constructed for intermittentlyrotating said head about its axis, substantially as described, mechanismfor rotating said gear-segment,and a spring-actuated lockbolt adapted toengage the lock-notches in the said head to lock the same againstrotation, and a cam for intermittently and automatically actuating saidlock-bolt, substantially as and for the purpose set forth.

5. In a screw-making machine, the combination with the framework, of themain horizontal shaft E supported at its ends as described, thecam-shaft F, the sliding tool-carriage having the vertical tool-head, aseries of tools carried by said tool-head, mechanism for imparting aforward and return movement to said tool-carriage, a revolubleworlecarrying head having remotely disposed peripheral lock-notchestherein, and having a gear-wheel fixed thereto or formed a part thereof,substantially as set forth, the gear-segment 30 in mesh with saidgear-wheel and adapted for intermittently rotating said wheel, alock-bolt adapted to engage the notches of the workcarrying head, alock-bolt-actuator and a cam secured to the cam-shaft and engaging saidactuator to operate the bolt, aseries of workcarrying spindles revolublysupported in the work-carrying head, gearing connecting said spindleswith the main shaft for rotating the same, and work-feeding and holdingdevices in engagement with said spindles all constructed and arranged,substantially as and for the purpose set forth.

6. In a screw-making machine, the combination of a sliding tool-carrierhead and a raw oluble work-carrying head adjustable one with relation tothe other, a longitudinally movable and intermittently revoluble die ortap-carrying spindle carried in a tubular shaft revolubly supported insaid head, a main shaft, gearing connecting said main shaft with, andadapted for rotating said tubular shaft and spindle, a pin-clutchinterposed between the spindle-head and tubular shaft, mechanism forsliding the tool-carrying head toward and from the work-carrying head, abrake-device connected with the die-spindle operative to lock saidspindle against rotation during the backward movement of the head,

a series of work-carrying spindles revoi'ubly supported in thework-carrying head, mechanism for rotating said spindles through theaction of the main shaft, a gear-wheel connected with the work-carryinghead, a gearsegment in mesh with said gear-wheel and adapted forintermittently rotating said head, a cam-actuated lock-bolt adapted toengage and lock the head in its successive positions,

IO a lock-bolt-actuator and a cam secured upon the cam-shaft journaledin the frame, which cam-shaft engages said bolt-actuator andintermittently retracts the bolt from its lockedengagement with theWork-carrying head, substantially as and for the purpose described.

REINHOLD HAKEWESSELL.

Witnesses:

FRED. J. DOLE, JOHN L. EDWARDS, Jr.

